Santa Maria Assunta, Romanesque church in Stia, Italy.

Santa Maria Assunta is a church in Stia whose exterior retains only the original side walls; the facade dates from 1777. The interior has three naves divided by monolithic sandstone columns with accentuated entasis and carved capitals, each different. The bell tower stands midway along the right side.

A document of 1017 names the Plebe S. Marie sito Stagia, a church popular legend credits to Duchess Matilda of Tuscany. Around 1150 the Guidi Counts rebuilt it above the earlier structure and placed their family burial ground beside it. In 1776 the rector Giovan Battista Rampini obtained permission to demolish the first of the seven bays and the old facade, and the present front was built in 1777.

The name Stia may derive from the Latin word for a covered passage, a reference to the market route along the Arno. The church faces Piazza Tanucci, the square that was enlarged in 1776 by demolishing the first bay and the old facade. The octagonal walnut pulpit between the naves bears the name Hieronimus and the date 1584.

The church stands on Piazza Tanucci, with its late-18th-century facade aligned to the square and the bell tower set into the right side about halfway along the building. The Etruscan-Roman column remains found in 1970-74 are visible through grates in the floor beside the main altar.

Each column in the right nave displays distinct carved capitals featuring different animals and human figures. These individual variations show how each stonemason left a personal artistic mark on the building.